﻿using System;
using System.Globalization;
using System.Windows.Data;
using DataStore.Domain;
using Infrastructure.ViewModels;

namespace Infrastructure.TypeConverters
{
    /// <summary>
    /// Converts LinkViewModels to string and back
    /// </summary>
    [ValueConversion(typeof(object), typeof(string))]
    public class LinkVMToStringConverter : IValueConverter
    {
        #region Implementation of IValueConverter

        /// <summary>
        /// Converts a value. 
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value produced by the binding source.</param><param name="targetType">The type of the binding target property.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {

            var link = value as LinkViewModel;
            if (link != null && link.Link != null && link.Link.Uri != null)
            {
                return link.Uri.LocalPath;
            }
            else
            {
                return string.Empty;
                //return Binding.DoNothing;
            }
        }

        /// <summary>
        /// Converts a value. 
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value that is produced by the binding target.</param><param name="targetType">The type to convert to.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
            {
                return Binding.DoNothing;
            }

            return new Link()
                       {
                           Location = LinkType.Local,
                           Uri = new Uri(value.ToString())
                       };
        }

        #endregion
    }
}